Study of molecular size in ethylene-propene copolymerization with zirconocene and hafnocene catalysts

Naofumi Naga, Yoshiaki Ohbayashi, Kooji Mizunuma

研究成果: Article査読

24 被引用数 (Scopus)

抄録

Ethylene-propene copolymerization was carried out with Cp2MCl2 (Cp = cyclopentadienyl), rac-Et(Ind)2MCl2, rac-Me2Si(Ind)2MCl2 (Et = ethylene, Me2Si = dimethylsilyl, Ind = indenyl, M = Zr or Hf)/methylaluminoxane. In the case of using ansa-hafnocenes, the minimum molecular size (extended chain length) of ethylene-propene copolymer was obtained at about 50 mol-% of propene content in the copolymer. The polymerization activity decreased with increase of propene feed ratio in non-bridged non-specific metallocenes. Higher polymerization activities were observed for the copolymerization compared to ethylene and propene homo-polymerization with ansa-isospecific metallocenes. The factor of molecular size lowering was studied by the chain propagation and chain transfer reaction.

本文言語English
ページ(範囲)837-851
ページ数15
ジャーナルMacromolecular Rapid Communications
18
9
DOI
出版ステータスPublished - 1997 9月
外部発表はい

ASJC Scopus subject areas

  • 有機化学
  • ポリマーおよびプラスチック
  • 材料化学

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